Solid jacket centrifugal separator



Sep't. 22, 1959. w. STICKER soun JACKET CENTRIFUGAL SEP ARATOR FiledA1ig. s, 1956 Inventar WILHELM S77CKF/i 4ttorneys Patented Sept. 22,1959 SOLID JACKET CENTRIFUGAL SEPARATOR Wilhelm Sticker, Kettwig (Ruhr),Germany, ssigner t Seciety les Censtructions Guinard, Courbeveie,France, a corperatien et France Applicatien August 3, 1956, Serial N0.601,941

1 Claim. (C1. 233-'14) The present inventien relates te a centrifugalseparater intended te separate the solid particles in a liquid-solidmixture intreduced in said separater and te discharge these particles.

Separaters ef this type, werking in centinuous service, are alreadyknown in which the discharge ef the solid matters is carried out bymeans ef an Arehimedean screw, mounted en the euter wall ef a drumending at one end in a cone over which the solid matters are discharged,said drum being retatably meunted in an euter drum which ferms also acone towards the same end and threugh which the liquid, afterseparatien, is discharged at a distance from the axis et the separatergreater than the distance at which the solid matters are discharged.

In the known centrifugal separators, of the type above mentioned, thematter te be treated enters inte the outer settling reern threughapertures previded in the wall of the wenn drum and divides inte twoparts, on the ene band, the liquid flewing towards the wider end ef thecentrifugal separater and the overflow-sheet located at that place anden the ether band, the solid matters couveyed by the wenn tewards thedi'scharge epening at the ether end ef the separater. Thereby, in thecentrifugal reem preper, two axially eppesed flews are generated, en theone hand the flow ef the liquid, and en the ether band the flow et thesolid matters.

This mede ef supply ef the matters to be treated is prejudicial as thesolid matters already separated are anew mixed by the whirling with theliquid, especially when the supply ef matters te be treatedthat is tesay the mixture ef the liquid and the solid particles-is carried out inthe immediate vicinity ef the spet where the centrifugally separatedsolid particles are lifted by the Archimedean screw above the level ofthe liquid in the centrifugal separater.

In order te suppress the whirls resulting frorn the supply ef matters tebe treated, a centrifugal separater ef the type above mentioned has beendesigned, in which the direction ef the flow et the whole ef the matterste be treated, frem its admissien taking place at the wider end et theouter drum up te the everflew ef the liquid, is the same as thedirection et the feed motien preduced by the werm and in which the solidparticles meving in this direction, after the overflow of the liquid,pass en the surface ef the euter drum ending in a cene in the directionef the feed up to the discharge epening previded fer these particles. Inthe known centrifugal separater, particularly designed to separateliquids frem matters, pasty er prevailingly liquid, such as the pulp etpotatoes er a suspensien of starch, the liquid is con veyed out ef thedepositien clramber by means ef discharge tubes radially projecting inthis chamber threugh the outer drum. These tubes have shewn te bedetrimental as they cause a disturbance in the phase ef depositienalready started, by hindering the metion ef the solid particles tewardsthe discharge epening and, if the solid particles are eventually in thegranular shape,

by bringing about a sleping accurnulatien in freut ef each dischargetube.

According te the invention, these drawbacks are niet in a centrifugalseparater of the type above mentioned in the fellowing manner:

The mixture ef liquid and solid matters is introdutzed, in a known way,threugh the wider end section of the outer drum, but cennectienapertures are previded in the Wall of the werm drum, lecated at suitabledistances from the end sectiens ef said werm-drum, threugh which theliquid enters into the inside ef the werm-drum to be later discharged byknown means, preferably in the direction epposite te the flow in theseparatien reom.

Preferably, the liquid entering inside the werm-drum flews tewards asceep-wheel mounted in a chamber directly cennected with the feedingdevice, the discharge channel ef said chamber being disposedconeentrically reund this feeding device.

Eventually, a device suitable te wash the separated solid particles, isprevided in this centrifugal separater accerding te the inventien.

The device censists preferably in a pipe fer the feed with pure waterextending axially in the werm-drumup te the vicinity ef the last eentactcircle between the ring ef liquid and the outer drum: the washing watersupplied by tl1is pipe is discharged threugh apertures previded in theWall ef the werm-drum 011 the euter surface et which said water washesthe solid matters.

By way ef exarnple, a ferm of embodiment of a Centrifugal separateraccerding te the invention is described hereafter with reference to theannexed drawing in which:

Figure 1 illustrates diagrammatically the principle ef the operatien ofdepositien.

Figure 2 is an axial sectien ef the centrifugal separater.

Figure 3 is a section aleng the line IIIIII ef Figure 2.

The principle of the operatien ef depositien according te the spirit ofthe inventien is clearly shewn in Figure 1.

It shews that the stream ef liquid 1 and the stream ef solid matters 2flow in the sarne direction in the depositien zene and that it is enlyafter the eperatien of depositien is completed that the streams arecempelled te flow in eppesite directions.

The section ef the centrifugal separater having a solid jacketillustrated in Figure 2 shews hew this principle is carried into effect.The matters te be treated, that is te say the mixture of a liquid andsolid matters, is sent, threugh the feeding pipe 3 in a feeding device 4arranged cencentrically reund the axis ef the separater and flews therefrem in the euter cylinder 5, in passing threugh the accelerater 6. Thedrum 5 is cylindrically shaped en the side ef the feed and cenicallyshaped er1 the side ef discharge of the solid particles but it ceuldalso be cenical over its entire length. After the decanta tien in thedepositien zone 7, the solid matters are raised up by the Arehimedeanscrew 8 previded upen the inner drum 18 above the level ef the liquid 9and cenveyed upen the inner conical surface 10 of the euter drum tewardsthe eutlet heles 11, te fall freely in the chamber 12 et. the casing 13of the separater. The Wall ef the werm-drum 18 is previded with passageapertures 14 near the circle aleng which the cylindrical pertien ef saidwerm drum 18 is cennected with its cenical end portien. T he decantedliquid is forced inside the wermdrum 18 threugh the passage apertures-14 en acceunt of the cenical shape and flews atterwards in the reversedirection tewards the eutlet apertures 19' which are peripherallyarranged in the bettem of said werm-drum 18 having the larger diameter;after passing said eutlet apertures 19, the decanted liquid isdischarged in the chamber 20 ef the sceep wheel threugh the channels 19of the accelerator 6. The statienary sceep wheel 21, cennected with thefeeding device 4 ferces centripetally,

in a kndwn yvay, the liquid under pressure towards the outside throughthe piping 22. keeps the liquid at a constnt level. It is possible tomodify.fthi s leyel by. thrgttliug the diselgrarge.

The drive of the centrifiigal Separater. tak'ea f l ce at the dis chargeside Qf the aolid matteis. The planetgear 23, necessary to prgiduce dierelative siaeeds between the outer druih and the worz 1idrurn-eonstitute a watertight block between the two maiii bearings 24,25 and is directly connected witl 1 the bo ttom 26 cf the drum. Theouter drum is driVen directly oy a motor through the pulley 27 and theconnected gear box while the relative speed is imparted to the wenndrurn through the auxiliary pulley 28 and the drive shaft 29 of theplanet gear 23. The relative speed can be modified within a large rang'eby imparting variable speeds to the auxilia-ry pulley 2 8.

Asillustrated in Figtire 2, the centnfugail separater is provided with awashing device used tq wash the solid matters separated frorn theliquid. Thia washing device is constituted by a pipe 30 axially enten'ngin the -centrifug al separater; 011 the one band, rotatably mo u nted inthe device supplying the washiflg water, 31, and oh the ther band,passing through a central aparture 34 provided in a transverse wall 32rigidly counected with the drum, at a small distance frorn the lastcontact qircle between the ring of liquid and the outer The scoop-wheel21 drum. The washing water is conveyed bY the pipe 33 tw o hellow bodiesof revolution, having the sarne shape, ta1ieiingtovzids bhe ei1d,eoaxially arranged, one inside the other to form thefbetween an annularchannel, an Archimedean screw fixed upon the outer surface of the innerbody, the height of the threads of said screw being adapted to theradial Width of said annular channel, means to impaft to' the two hollowbodies different :;p eec ls. o f r otat ion round their common axis, afeeding device to supply the miJ itilr e, concehtricallY arrangea'1'i1dth axis of rotati0n 'o'f the h0ll0w bodies, an accelertor arrangedto k:orivty the ifii5 tt1re frcili1 said feeding device in the endsectioii haVing a larger diameter ofthe annular channel, means todischarge, near the end Section of smaller diameter of said annularchannel, the solid iihs'e cntriftiglly expelled against the inner wallof the outer body and conveyed by the Archimedeau screw above the freesurface of the liquid, apertures in the wall of the inner hollow bodynear its contact circle with the free surface of the ring of liquid tqlet the purified liquid penetrate inside said hollow body where it flowsin the direction opposite to the flow 0f the mixture in the annularchannel, a fixed seoop wheel provided with a central discharge charmelarranged eoncei1trically wund the feeding device and peripheral charmelspassing through the accelerator and disposed to guide the purifiedliquid flowing from the i1 1- 11er face of the inner body towards theperiphery of said sc;oop wheel.

lieferences Cited in the file of this patent UNITED STATES PATENTS1429320 Bbuilloir Sept. 19, 1922 2,5784 56 Smith Dec. 11, 1951 2,578,485Nyrop Dec. 11, 1951 2614748 Ritsbh Oct. 21, 1952 FORElGN PATENTS 1067028France Jan. 27, 1954

